Those are good choices for do it all bikes, although be forewarned that Salsa is discontinuing the Casseroll for 2013. You might have trouble finding one in your size. The Salsa Vaya might be a good alternative.
If this isn't your first bike, try to compare the geometry of your current bike (assuming it fits) to the geometry charts for Salsa and Surly. See if there's anything close. How tall are you? What's your inseam? Are you long armed and how's your flexibility? Maybe we can help narrow it down for you. Once you have the bike, feel free to schedule an appointment with a fitter at another shop. You'll have to pay for a comprehensive fitting, but it will be well worth the money.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher